That is correct. Basically it rides piggy back on the trust-authority of Blockchain verifiability. Further to so said the basic simplicity of the time stamp provides robust deyeination of a requirement of knowledge of said file (or dorectory) itself in order to concede access to 'that' ( particular) file. I am in no way denying the logistically required effort (predominant to complexity of a. Manifesting such a security and b. Making sure you don't accidently, tautologically lock yourself out of your own data. I'm basically working on a VERY slim Blockchain mobile OS predominantly deogned for travel, journalism and other facets requiring not a large particular amount of operation (such as gaming), but a high amount of very precise and virtually unbrechable data access protection.